Hamilton was a founding father of the United States, and played a key role which began all the way from when he fought in the Revolutionary War, which led to American independence. I'm gonna go ahead and make the blanket statement that his name was on every significant piece of paper until his political party (the first one ever in the U.S.) lost control to Thomas Jefferson and the Republicans in 1800– Which was Hamilton's decision as well, by the way. He wrote major journals (Federalist Papers) that put his ideas in the center of states' attention, giving him enough influence to take part in a commerce-related meeting in Cincinnati a year before the Constitution was signed. When nothing came out of that meeting, he made everyone promise to meet again the next year to figure some more shit out, and that's when they ended up writing the U.S. Constitution we all know. Then, Washington made him secretary of Treasury and he established the economic strategy, with the use of bonds as well as lies, that the U.S. uses to this day to keep its economy stable. I haven't yet learned in detail what happens after that, but I can keep you posted :D